| /* |
| * Copyright (c) 2016, Oracle and/or its affiliates. All rights reserved. |
| * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER. |
| * |
| * This code is free software; you can redistribute it and/or modify it |
| * under the terms of the GNU General Public License version 2 only, as |
| * published by the Free Software Foundation. Oracle designates this |
| * particular file as subject to the "Classpath" exception as provided |
| * by Oracle in the LICENSE file that accompanied this code. |
| * |
| * This code is distributed in the hope that it will be useful, but WITHOUT |
| * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or |
| * FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License |
| * version 2 for more details (a copy is included in the LICENSE file that |
| * accompanied this code). |
| * |
| * You should have received a copy of the GNU General Public License version |
| * 2 along with this work; if not, write to the Free Software Foundation, |
| * Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA. |
| * |
| * Please contact Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA |
| * or visit www.oracle.com if you need additional information or have any |
| * questions. |
| */ |
| package jdk.jshell; |
| |
| import java.util.Arrays; |
| import java.util.HashMap; |
| import java.util.Objects; |
| import jdk.jshell.spi.ExecutionControl.ClassBytecodes; |
| |
| /** |
| * Tracks the state of a class. |
| */ |
| class ClassTracker { |
| |
| private final HashMap<String, ClassInfo> map; |
| |
| ClassTracker() { |
| this.map = new HashMap<>(); |
| } |
| |
| /** |
| * Associates a class name, class bytes (current and loaded). |
| */ |
| class ClassInfo { |
| |
| // The name of the class |
| private final String className; |
| |
| // The corresponding compiled class bytes when a load or redefine |
| // is started. May not be the loaded bytes. May be null. |
| private byte[] currentBytes; |
| |
| // The class bytes successfully loaded/redefined into the remote VM. |
| private byte[] loadedBytes; |
| |
| private ClassInfo(String className) { |
| this.className = className; |
| } |
| |
| String getClassName() { |
| return className; |
| } |
| |
| byte[] getLoadedBytes() { |
| return loadedBytes; |
| } |
| |
| byte[] getCurrentBytes() { |
| return currentBytes; |
| } |
| |
| void setCurrentBytes(byte[] bytes) { |
| this.currentBytes = bytes; |
| } |
| |
| void setLoadedBytes(byte[] bytes) { |
| this.loadedBytes = bytes; |
| } |
| |
| boolean isLoaded() { |
| return loadedBytes != null; |
| } |
| |
| boolean isCurrent() { |
| return Arrays.equals(currentBytes, loadedBytes); |
| } |
| |
| ClassBytecodes toClassBytecodes() { |
| return new ClassBytecodes(className, currentBytes); |
| } |
| |
| @Override |
| public boolean equals(Object o) { |
| return o instanceof ClassInfo |
| && ((ClassInfo) o).className.equals(className); |
| } |
| |
| @Override |
| public int hashCode() { |
| return Objects.hashCode(this.className); |
| } |
| } |
| |
| void markLoaded(ClassBytecodes[] cbcs) { |
| for (ClassBytecodes cbc : cbcs) { |
| get(cbc.name()).setLoadedBytes(cbc.bytecodes()); |
| } |
| } |
| |
| void markLoaded(ClassBytecodes[] cbcs, boolean[] isLoaded) { |
| for (int i = 0; i < cbcs.length; ++i) { |
| if (isLoaded[i]) { |
| ClassBytecodes cbc = cbcs[i]; |
| get(cbc.name()).setLoadedBytes(cbc.bytecodes()); |
| } |
| } |
| } |
| |
| // Map a class name to the current compiled class bytes. |
| void setCurrentBytes(String className, byte[] bytes) { |
| ClassInfo ci = get(className); |
| ci.setCurrentBytes(bytes); |
| } |
| |
| // Lookup the ClassInfo by class name, create if it does not exist. |
| ClassInfo get(String className) { |
| return map.computeIfAbsent(className, ClassInfo::new); |
| } |
| } |